As far as having a leader, considering none of us knows the others. I think we should just go on this first quest and see who, out of the ten of us, emerge as possible choices and then decide on one.
As for the maps well there I have to disagree also. As the only Ranger of the party it's gonna be up to me to find the best route to where we want to go and having the maps with me I'm sure would be a big help. However that is a party call and I'll go with the majority.
The ranger should probably study the map each day but because he is out front and might get killed he should not carry the only map. Map is probably best kept in the main party. Of course the carrier should be able to read but that is kind of obvious.
Well I too cast my vote for our Ranger to be the leader and map wielder. If we're afraid of him dying then my Knight can always stay up front with him for added protection. Just a suggestion.